In the ISCLT model, the user has an option to have the highest 10 values for each source and source group reported independently, or to have the 10 highest values from the combined source group and the contributions from the individual sources to those highest group values.
1.3 RELATION TO PREVIOUS VERSIONS OF ISC
1.3.1 Brief History of the ISC Models
The ISC3 models are based on revisions to the algorithms contained in the ISC2 models. The latter came about as a result of a major effort to restructure and reprogram the ISC models that began in April 1989, and was completed in March 1992. The reprogramming effort was largely motivated by the need to improve the quality, reliability, and maintainability of the code when numerous "bugs" were discovered after the implementation of the revised downwash algorithms for shorter stacks. It became widely recognized that the code, originally developed in the 1970's and modified numerous times since, had become impossible to reliably modify, debug or maintain. However, the goals of the reprogramming effort also included improving the user interface by modifying the input file structure and the output products, and to provide better "end user" documentation for the revised models. The ISC2 models were developed as replacements for and not updates to the previous versions of the models.
1.3.2 Overview of New Features in the ISC3 Models
The ISC3 models include several new features. A revised area source algorithm and revised dry deposition algorithm have been incorporated in the models. The ISC3 models also include an algorithm for modeling impacts of particulate emissions from open pit sources, such as surface coal mines. The Short Term model includes a new wet deposition algorithm, and also incorporates the COMPLEX1 screening model algorithms for use with complex and intermediate terrain. When both simple and complex terrain algorithms are included in a Short Term model run, the model will select the higher impact from the two algorithms on an hour-by-hour, source-by-source, and receptor-by-receptor basis for receptors located on intermediate terrain, i.e., terrain located between the release height and the plume height. A more detailed technical description of these new features of the ISC models is included in Volume II of the ISC User's Guide. The Long Term model does not include wet deposition or complex terrain algorithms.
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APLICACIONES castellano: DIS CUS DES RAD english: DIS CUS DES RAD
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français: DIS CUS DES RAD